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The market has reacted to the imminent sequestration deadline with a lackadaisical shrug. Although indexes have been hovering around five-year highs, you have to wonder why so few investors seem concerned that terrible gusts of economic headwinds could wipe out many companies' profitability.

The market is indeed bipolar, but the supposedly smartest professionals are reluctant to make the diagnosis and get clinical about the reality.

Investors shouldn't panic and ditch stocks, but it's time to do some portfolio housecleaning and aim to focus on the best, most well-positioned companies. Read on for why investors should worry, and how to change your investment strategy so you can sleep at night.

Scorched earth and shrinking prospectsAlong with still-high levels of unemployment, continued mass layoffs, rising gas prices, payroll tax hikes, and other negative factors, sequestration could send serious ripple effects throughout the public and private sectors. This isn't simply limited to government agencies and services. Take defense contractors, many of which are publicly traded. The federal government pays out $500 billion every year to such firms, and contractors represent 7.5 million workers.

Regardless of where the money comes from, fewer jobs and slashed consumer incomes can devastate economies. When individuals stop spending, it hurts everyone else's income and spending power, affecting businesses from mom-and-pop restaurants to maid brigades to gardeners to giant corporations like Wal-Mart.

Although paring U.S. debt, reducing government spending, and getting America's fiscal house in order are all rational goals, a scorched-earth policy is hardly a reasonable path to get there. As far as investors go, it's time to look beyond today, this month, or next quarter and realize that these tactics threaten many companies' sales and profits at a time when the economy is still very fragile.

La-la-la, we're not listeningTraders don't seem too troubled today; the rest of us should wonder what they've been smoking.

Earlier this week, Federal Reserve Chairman Ben Bernanke defended the Fed's continued unprecedented levels of stimulus given economic negatives like still-high unemployment. In addition, he admonished Congress for its poor handling of the sequestration mess and its potential to hurt GDP.

Interestingly, though, Bernanke also said, "I see no evidence of a stock bubble" despite the fact that the market's hovering near five-year highs. And this rally has come way before much meaningful recovery as well as during continued economic drags.

Hit rewind, and recall that Fed Chairman Alan Greenspan failed to detect another big bubble: housing. Bernanke didn't believe there was one, either, right before he was nominated as the next chairman. We're still digging out of that debacle. His failure to detect came at a time when almost everyone was convinced the artificially pumped-up economy was actually healthy, too.

Bernanke indicated that strong corporate earnings explain the rally mode. That's not exactly correct. Many of us know that profits are being juiced by many companies through cost-cutting, not actual sales growth.

The strong surviveThe overall picture isn't pretty, particularly when you throw sequestration into the already nasty mix. We shouldn't give up on stocks, but we should admit that some are heading for a fall and focus our portfolios on the strongest companies with the brightest futures, strong balance sheets, and great leadership.

That also means avoiding value traps at all costs. For example, tidings from J.C. Penney and Sears Holdings show these two companies are like two drunks tethered together jumping out of a plane. This pair is unlikely to navigate a far more challenging macro climate.

J.C. Penney's quarterly results were horrific, with a mind-boggling 32% decline in same-store sales in the holiday quarter. Yesterday, Standard & Poor's cut its debt rating on top of the obviously ugly news in its financial release.

Sears may have reported a "less bad" quarter this week than in the past, narrowing its quarterly loss, but sales still dropped by 2% and same-store sales fell 1.6%. It's also topped a list that's no reason to celebrate: It's become the most shorted company on the Nasdaq.

Best Buy bucked the trend by reporting a better-than-expected quarter, but don't be fooled. Revenue and same-store sales were still weak, rising anemically by 0.2% and 0.9%, respectively.

Rather than falling for value traps, investors should hold gold-standard companies throughout today's uncertain times. The Motley Fool's list ofThe 25 Best Companies in America gives investors great ideas for protecting their portfolios from dangerous, weak stock holdings. The Fool's list points to companies that are built to survive and thrive because their focus is not solely shareholder value but also the value they create for customers, employees, and the world.

There are some surprise stock ideas to consider here, too. The company that came in at No. 1 is one many of us may not have even heard of: Cummins . It manufactures engines, but part of its magic is its emphasis on cutting greenhouse gas emissions and launching world-friendly initiatives like the Technical Education for Communities Program, which trains young people in economically challenged communities the skills they need to work at companies like Cummins.

What really powers prosperityFocusing on great companies is a great investment policy during times of economic hardship and prosperity alike. The companies that take more into account than simply shareholder value boost our economy instead of detracting from it. So let's hunker down and protect our portfolios.

If you're looking for more stock ideas, The Motley Fool's chief investment officer has selected his No. 1 stock for the next year. Find out which stock it is in the brand-new free report: "The Motley Fool's Top Stock for 2013." Just click here to access the report and find out the name of this under-the-radar company.

Check back atFool.comfor more of Alyce Lomax's columns on environmental, social, and governance issues.